In 1981, Maule installed an IO-540-W1A5D out front of the M-5 and began delivering the M-6, also available with EDO floats. Two years later the model would morph into the M-7 and in 1989, the M-8.
Undercarriage: conventional widegear
Engine: Lyc (I)O 540, 235 hp
TBO: 2000 hr